Question

我使用animator类生成ellipseobject并向其添加动画，目标只是改变点的比例（从双倍大小到正常大小），但不进行翻译。现在我所面对的是点确实收缩，但它从（x y值是其原始x y值的两倍）到其原始x y位置的位置移动。

这是动画师课程

class Animator:
    def __init__(self, animation_config, num_rows, num_cols, background_colour, parent, user_idx = 0, resolution_width = 1920,
                  resolution_height = 1200, log_file_path = "coordinates.txt"):
        with open(log_file_path, "w") as log_file:
            log_file.write("")

        circle = animation_config["circle"]
        self.__cur_circle = None
        self.__cur_colour = None
        self.__animated_colour = QColor(*circle["colour"])
        self.__log_file_path = log_file_path

        # Initialize the circle table

        diamond_square = DiamondSquare()
        self.__user_idx = user_idx % 64
        shift_xn = diamond_square.dx[user_idx]
        shift_yn = diamond_square.dy[user_idx]
        intv_x = (resolution_width - 20) / 10
        intv_y = (resolution_height - 20) / 10
        print(shift_xn,shift_yn)
        self.__circle_table = []
        y = 0
        for i in range (11):
            circles = []
            x = 0
            for j in range (11):
                cir_x = (j * intv_x) + shift_xn
                cir_y = (i * intv_y) + shift_yn
                print(cir_x,cir_y)
                if cir_x <= resolution_width and cir_y <= resolution_height:
                    circles.append(EllipseObject(parent,cir_x,cir_y, x, y, intv_x, intv_y,
                                                 hidden_colour = background_colour,
                                                 display_colour=self.__animated_colour))
                    x += 1
            y += 1

            self.__circle_table.append(circles)

        # Initalize the first animation
        self.__first = QPropertyAnimation()
        self.__first.setPropertyName(b"scale")
        self.__first.setDuration(animation_config["animation_duration"])
        self.__first.setStartValue(2)
        self.__first.setEndValue(1)

这是我的EllipseObject类

class EllipseObject(QGraphicsWidget):
    def __init__(
        self,
        parent,
        x = 0,
        y = 0,
        ind_x = 0,
        ind_y = 0,
        intv_x = 0,
        intv_y = 0,
        width = 20,
        height = 20,
        hidden = True,
        hidden_colour = QColor(Qt.white),
        display_colour = QColor(Qt.black)
        ):

        super().__init__(parent)
        self.__x = x
        self.__y = y
        self.__ind_x = ind_x
        self.__ind_y = ind_y
        self.__intv_x = intv_x
        self.__intv_y = intv_y
        self.__height = height
        self.__width = width
        self.hidden = hidden
        self.hidden_colour = hidden_colour
        self.display_colour = display_colour

    def paint(self, painter, option, widget = None):
        colour = QColor(Qt.white) if self.hidden else self.display_colour
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setPen(colour)
        painter.setBrush(QBrush(colour))
        # painter.drawEllipse(self.__x, self.__y, self.__width, self.__height)
        painter.drawEllipse(self.boundingRect())
        # point = self.mapToScene(self.boundingRect().center())
        # print("Draw this ",point.x(), point.y())

    def get_coordinates(self):
        point = self.mapToScene(self.boundingRect().center())
        return (point.x(), point.y())

    def boundingRect(self):
        return QRectF(self.__x,
                      self.__y,
                      self.__height, self.__width)

Answer 1

你可能观察到的是它相对于左上角正在上升并且会给你它正在移动的外观。 QGraphicsItem有一个名为transformOriginPoint的属性，执行转换（如旋转和缩放），并在点（0,0）处找到。在您的情况下，您的代码有多处错误，您必须使用setPos()而非boundingRect()设置位置，以便相对于项目中心的缩放确定boundingRect()是对称的。

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

class EllipseObject(QGraphicsWidget):
    def __init__(
        self,
        parent=None,
        x = 0,
        y = 0,
        ind_x = 0,
        ind_y = 0,
        intv_x = 0,
        intv_y = 0,
        width = 20,
        height = 20,
        hidden = True,
        hidden_colour = QColor(Qt.white),
        display_colour = QColor(Qt.black)
        ):

        super().__init__(parent)
        self.__x = x
        self.__y = y
        self.__ind_x = ind_x
        self.__ind_y = ind_y
        self.__intv_x = intv_x
        self.__intv_y = intv_y
        self.__height = height
        self.__width = width
        self.hidden = hidden
        self.hidden_colour = hidden_colour
        self.display_colour = display_colour
        self.setPos(self.__x, self.__y)

    def paint(self, painter, option, widget = None):
        colour = QColor(Qt.white) if self.hidden else self.display_colour
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setPen(colour)
        painter.setBrush(QBrush(colour))
        # painter.drawEllipse(self.__x, self.__y, self.__width, self.__height)
        painter.drawEllipse(self.boundingRect())

    def get_coordinates(self):
        return (self.pos().x(), self.pos().y())

    def boundingRect(self):
        return QRectF(-0.5*self.__width,
                      -0.5*self.__height,
                      self.__height, self.__width)


if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)
    w = QGraphicsView()
    scene = QGraphicsScene(w)
    w.setScene(scene)
    it = EllipseObject(x=100, y=100, hidden=False)
    scene.addItem(it)

    animation = QPropertyAnimation(it, b"scale")
    animation.setDuration(2000)
    animation.setStartValue(2)
    animation.setEndValue(1)
    animation.start()
    w.show()
    sys.exit(app.exec_())

注意：

不要使用名为hidden的标记，而是直接使用setVisible(boolean)，show()或hide()。 Qt已经实现了很多方法，轮子不会重新发明。

qtpropertyanimation只改变比例

1 个答案: